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Manitowoc STH044 1/18 Technician's Handbook
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Manitowoc STH044 1/18 Technician's Handbook

Manitowoc STH044 1/18 Technician's Handbook

Countertop nugget ice machines
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Countertop Nugget
Ice Machines
RNS012 & RNS020
Technician's Handbook
Part Number STH044 1/18

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Summary of Contents for Manitowoc STH044 1/18

  • Page 1 Countertop Nugget Ice Machines RNS012 & RNS020 Technician’s Handbook Part Number STH044 1/18...
  • Page 3 Safety Notices Read these precautions to prevent personal injury: • Read this manual thoroughly before operating, installing or performing maintenance on the equipment. Failure to follow instructions in this manual can cause property damage, injury or death. • Routine adjustments and maintenance procedures outlined in this manual are not covered by the warranty.
  • Page 4 Warning Follow these electrical requirements during installation of this equipment. • All field wiring must conform to all applicable codes of the authority having jurisdiction. It is the responsibility of the end user to provide the disconnect means to satisfy local codes. Refer to rating plate for proper voltage.
  • Page 5 Warning Follow these precautions to prevent personal injury during installation of this equipment: • Installation must comply with all applicable equipment fire and health codes with the authority having jurisdiction. • To avoid instability the installation area must be capable of supporting the combined weight of the equipment and product.
  • Page 6 Warning Follow these precautions to prevent personal injury while operating or maintaining this equipment. • Legs or casters must be installed and the legs/casters must be screwed in completely. When casters are installed the mass of this unit will allow it to move uncontrolled on an inclined surface.
  • Page 7 Warning Follow these precautions to prevent personal injury while operating or maintaining this equipment. • Objects placed or dropped in the bin can affect human health and safety. Locate and remove any objects immediately. • Never use sharp objects or tools to remove ice or frost.
  • Page 8 Warning Follow these precautions to prevent personal injury during use and maintenance of this equipment: • It is the responsibility of the equipment owner to perform a Personal Protective Equipment Hazard Assessment to ensure adequate protection during maintenance procedures. • Do Not Store Or Use Gasoline Or Other Flammable Vapors Or Liquids In The Vicinity Of This Or Any Other...
  • Page 9 Model/Serial Number Location . . . . . . . . . . . . . . . . . 13 Manitowoc Cleaner and Sanitizer . . . . . . . . . . . . . . . 13 Legs .
  • Page 10 Maintenance Manitowoc’s Cleaning Technology . . . . . . . . . . . . . . 26 Exterior Cleaning ......27 Preventative Maintenance Procedure .
  • Page 11 Cleanup Procedure ..... .95 Replacing Pressure Controls Without Removing Refrigerant Charge ..... .98 Part Number STH044 1/18...
  • Page 12 RNS012A ......104 RNS020A ......105 Part Number STH044 1/18...
  • Page 13 Model/Serial Number Location These numbers are required when requesting information from your local Manitowoc Distributor, service representative, or Manitowoc Ice, Inc. The model and serial number are listed on the OWNER WARRANTY REGISTRATION CARD. They are also listed on the MODEL/ SERIAL NUMBER DECAL affixed to the ice machine.
  • Page 14 Scan the QR code with your smart device or enter the link in a web browser to complete your warranty registration. www.manitowocice.com/Service/Warranty#Warranty-Registration Registering your product insures warranty coverage and streamlines the process if any warranty work is required. Part Number STH044 1/18...
  • Page 15 Refer to chart for clearance requirements. • The ice machine must be protected if it will be subjected to temperatures below 32°F (0°C). Failure caused by exposure to freezing temperatures is not covered by the warranty. See “Removal from Service/ Winterization” Part Number STH044 1/18...
  • Page 16 Ice machines, like other refrigeration equipment, reject heat through the condenser. It is helpful to know the amount of heat rejected by the ice machine when sizing air conditioning equipment where self-contained air-cooled ice machines are installed. Part Number STH044 1/18...
  • Page 17 The wire size (or gauge) is also dependent upon location, materials used, length of run, etc., so it must be determined by a qualified electrician. Self Contained Air-Cooled Voltage Phase Max. Fuse/ Ice Machine Total Amps Cycle Circuit Breaker RNS012 115/1/60 10.3 RNS020 230/1/50 Part Number STH044 1/18...
  • Page 18 Importar If you are installing a Manitowoc water filter system, refer to the Installation Instructions supplied with the filter system for ice making water inlet connections.
  • Page 19 Run separate bin drain line. Insulate to prevent condensation. • Vent the bin drain to the atmosphere. • Drains must have a union or other suitable means to allow a place of disconnection from the ice machine when servicing is required. Part Number STH044 1/18...
  • Page 20 THIS PAGE INTENTIONALLY LEFT BLANK Part Number STH044 1/18...
  • Page 21 The float valve automatically maintains the water level in the reservoir. The ice damper will open and close to verify ice production. The ice machine will continue to make ice until the ice damper is held open (up) as ice fills the bin. Part Number STH044 1/18...
  • Page 22 Moving the toggle switch immediately to the ICE position - The ice machine waits 15 minutes, then starts. • Moving the toggle switch to the ICE position after 15 minutes have elapsed - The ice machine immediately starts. Part Number STH044 1/18...
  • Page 23 The water level is correct if the Water Level indicator light is energized and no water is entering the overflow tube. The float valve is secured with 2 stop nuts. If an adjustment is required, raise or lower the stop nuts as needed. Part Number STH044 1/18...
  • Page 24 Part Number STH044 1/18...
  • Page 25 Maintenance Maintenance procedures or failures due to a lack of maintenance are not covered by the warranty. Manitowoc Ice Machine Cleaner and Sanitizer are the only products approved for use in Manitowoc ice machines. Caution Use the correct Manitowoc approved metal safe Ice Machine Cleaner (part number 000000084) and Sanitizer (part number 9405653).
  • Page 26 Manitowoc’s Cleaning Technology Manitowoc RNS012 - RNS020 Ice Machines allow the initiation and completion of a cleaning cycle at the flip of a switch. This cycle will permit cleaning of all surfaces that come in contact with the water distribution system.
  • Page 27 Wipe sensor window with a soft cloth and mild detergent. Rinse with clear water and dry with a clean soft cloth. Dust and dirt can be removed from exterior surfaces with mild household dish-washing detergent and warm water. Wipe dry with a clean, soft cloth. Part Number STH044 1/18...
  • Page 28 It is not used to remove algae or slime. Refer to “Sanitizing Procedure” for removal of algae and slime. To initiate a cleaning cycle using Manitowoc’s Cleaning Technology use the following procedure. To start a cleaning cycle, move the toggle switch Step 1 to the CLEAN position.
  • Page 29 NOTE: The ice machine may be set to start and finish a cleaning procedure, and then automatically start ice making again After cleaner is added, move the switch from CLEAN to ICE position. When the cleaning cycle is complete, ice making will start automatically. Part Number STH044 1/18...
  • Page 30 3. To abort the clean cycle move the toggle switch from CLEAN to OFF to CLEAN and back to OFF within a 15 second time period. Manitowoc recommends disassembling, cleaning and sanitizing the ice machine and dispenser every six months. Part Number STH044 1/18...
  • Page 31 OFF position. Refer to chart and add the correct amount of Step 6 cleaner for your model ice machine. Model Amount of Cleaner Part Number 000000084 RNS012 RNS020 12 ounces (355 ml) Part Number STH044 1/18...
  • Page 32 Step 8 compressor will energize and produce ice with the cleaning solution. Continue the freeze cycle for 15 minutes. Move the toggle switch to the OFF position, Step 9 then follow the standard cleaning and sanitizing procedures. Part Number STH044 1/18...
  • Page 33 OFF position. Caution Use only Manitowoc approved Ice Machine Cleaner part number 000000084. It is a violation of Federal law to use these solutions in a manner inconsistent with their labeling. Read and understand all labels printed on bottles before use.
  • Page 34 Refer to “Removal of Parts for Cleaning or Sanitizing” on page 38 - Disassemble, clean and sanitize the ice machine a minimum of once every six months. Part Number STH044 1/18...
  • Page 35 Turn on the water supply to the ice machine. Step 7 Move the toggle switch to the ICE position. The Step 8 compressor will energize after the 15 minute delay and produce ice with the sanitizing solution. Part Number STH044 1/18...
  • Page 36 The ice machine will automatically time out a series of flush and rinse cycles, and then stops. This entire cycle lasts approximately 30 minutes. Refer to Component Disassembly for Cleaning Step 12 and Sanitizing and remove, clean and sanitize all parts listed. Part Number STH044 1/18...
  • Page 37 3. Soak the removed parts to clean and sanitize. Solution Water Mixed With Type Cleaner 1 gal. (4 L) 16 oz. (500 ml) cleaner Sanitizer 6 gal. (23 L) 4 oz. (120 ml) sanitizer Part Number STH044 1/18...
  • Page 38 Disconnect electric power to the ice machine at the electric switch box before proceeding. 4. Disconnect electrical power to the ice machine. 5. Remove top cover. Remove two screws. Lift up on top cover to remove. Part Number STH044 1/18...
  • Page 39 REMOVE SCREWS Part Number STH044 1/18...
  • Page 40 6. Remove front cover. Lift up on front cover. Pull forward to disengage keyhole slots. 7. Remove side panels. Part Number STH044 1/18...
  • Page 41 8. Remove ice chute cover Turn the two thumbscrews 1/4 turn. Lift to remove cover. LOOSEN SCREWS Part Number STH044 1/18...
  • Page 42 9. Lift out ice damper. Part Number STH044 1/18...
  • Page 43 10. Lift out ice strainer ramp. Part Number STH044 1/18...
  • Page 44 11. Turn ice wiper counterclockwise to remove. Part Number STH044 1/18...
  • Page 45 12. Loosen ice chute hose clamp. 13. Disconnect ice chute drain. 14. Lift up on ice chute to remove. The ice chute must be removed before the bin cover can be removed. Part Number STH044 1/18...
  • Page 46 15. The ice chute can be cleaned in place. If complete removal is desired, use a Phillips screwdriver to remove the Hall Effect switch assembly from the ice chute. REMOVE SCREW Part Number STH044 1/18...
  • Page 47 16. Remove three thumbscrews, then remove bin cover. REMOVE THUMBSCREWS Ippottat Do not pour cleaner or sanitizer solutions into the bin. The solution will leak out of the front of the bin and into the compressor compartment. Part Number STH044 1/18...
  • Page 48 NOTE: Bar must be reassembled by inserting front edge into the paddle wheel, then lowering the back edge (rounded 90 angle) to prevent water leakage into the compressor compartment. RNS020 REMOVE AGITATOR, AGITATOR BAR AND ICE BREAKER RNS012 REMOVE THUMBSCREW AND AGITATOR BAR Part Number STH044 1/18...
  • Page 49 18. Remove ice deflector. Remove the two thumbscrews. Lift the ice deflector out. REMOVE THUMBSCREW Part Number STH044 1/18...
  • Page 50 19. Remove ice dispensing wheel by lifting straight out. 20. Water Reservoir Cover Removal Push up on cover to snap off. Part Number STH044 1/18...
  • Page 51 Do not bend the fan blades. If the fan blades are excessively dirty, wash with warm, soapy water and rinse thoroughly. Warning If you are cleaning the condenser fan blades with water, cover the fan motor to prevent water damage. Part Number STH044 1/18...
  • Page 52 4. Disconnect drain tubing (from the inlet to dump valve) and drain water into container and discard. 5. Make sure water is not trapped in any of the water or drain lines. Part Number STH044 1/18...
  • Page 53 The light will de-energize and a start-up sequence will initiate. The corresponding light will flash anytime the toggle switch is placed in the OFF position provided 48 hours of ice making time has not been exceeded. Part Number STH044 1/18...
  • Page 54 If the ice machine continues to run, the condition has corrected itself. Allow the ice machine to continue running. If the ice machine stops, determine the safeguard mode, then refer to the specific safeguard for troubleshooting procedures. Part Number STH044 1/18...
  • Page 55 The water Ok light will flash when the float switch closes or when the toggle switch is placed in the OFF position. The ice machine will remain off until the 15-minute delay period expires and the water float switch closes. Part Number STH044 1/18...
  • Page 56 3. A 15-minute delay is initiated. 4. After the 15-minute delay the ice machine will: Energize the dump valve for 30 seconds Energize the gear motor Wait until the water float valve closes and then energize the compressor and fan motor. Part Number STH044 1/18...
  • Page 57 OFF position for the first 48 hours after the failure. Reset Procedure Move the ICE/OFF/CLEAN toggle switch from OFF to ICE or disconnect and reapply power to the ice machine. Part Number STH044 1/18...
  • Page 58 When the ice damper lifts approximately 45 degrees, HES #2 de-energizes and the ice machine shuts off immediately on full bin. A 15-minute time delay is initiated, which prevents the ice machine from immediately restarting. Part Number STH044 1/18...
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  • Page 63 Part Number STH044 1/18...
  • Page 64 Filter and/or condenser is dirty. Clean the filter and condenser. Water filtration is plugged (if Install a new water filter. used). Water drain is not vented or is Run and vent drains according improperly installed. to the installation manual. Part Number STH044 1/18...
  • Page 65 Hoses, fittings, etc., are Repair/replace as needed. leaking water. Water float valve is stuck Clean/replace as needed. open or closed. Dump valve is leaking. Clean dump valve. Ice machine will shut off on Low Water SafeGuard. Part Number STH044 1/18...
  • Page 66 5. Ice production checks that are within 10% of the charted capacity are considered normal due to variances in air and water temperatures. Actual temperatures will seldom match the chart exactly. Part Number STH044 1/18...
  • Page 67 Condenser discharge air recirculation flow Dirty condenser fins Defective fan motor Improper Overcharged refrigerant Non-condensible in system charge Wrong type of refrigerant Non-Manitowoc components in system Other High side refrigerant line/component restricted (before mid-condenser) Part Number STH044 1/18...
  • Page 68 (Refer to “Suction Pressure Low Checklist.”) No water or insufficient pressure Expansion valve incorrectly adjusted Defective compressor Moisture in refrigeration system NOTE: Do not limit your diagnosis to only the items listed in the checklists. Part Number STH044 1/18...
  • Page 69 Discharge suction pressure. Refer to “Discharge Pressure pressure High Checklist.” Improper Overcharged refrigerant Wrong type of refrigerant charge Non condensible in system Dump valve leaking Non-Manitowoc components in system Other Expansion valve incorrectly adjusted Defective compressor Part Number STH044 1/18...
  • Page 70 Restricted/plugged tubing in suction side of refrigeration system Other Expansion valve starving No water or insufficient pressure Moisture in refrigeration system Dirty Evaporator NOTE: Do not limit your diagnosis to only the items listed in the checklist. Part Number STH044 1/18...
  • Page 71 Warning Disconnect electrical power to the entire ice machine before proceeding. 2. Remove the fuse. Check for continuity across the fuse with an ohmmeter. Reading Result Open (OL) Replace fuse Closed (O) Fuse is good Part Number STH044 1/18...
  • Page 72 Switch Setting Terminals Ohm Reading Open Closed Open Closed CLEAN Open Open Open Open Open 4. Replace the toggle switch if continuity readings do not match all three switch settings. Part Number STH044 1/18...
  • Page 73 Step 3 Check for Continuity Reading Result Closed The switch is working properly Open Replace the switch 4. Remove cover from reservoir by lifting straight up. Verify the switch opens as the float drops. Part Number STH044 1/18...
  • Page 74 Move ice damper slowly to open position. • HES#1 light de-energizes, HES#2 remains energized. • HES#2 light de-energizes as damper continues to open. Move damper slowly to closed position. HES#2 energizes, HES#1 remains de-energized. HES#1 energizes as the damper continues to close. Part Number STH044 1/18...
  • Page 75 2. Wait 15 minutes for delay to expire. 3. HES#2 light is energized and HES#1 light is de- energized. 4. Ice machine starts. 5. After 15 minutes the ice machine shuts off. HES#1 is de-energized and HES#2 is energized. Part Number STH044 1/18...
  • Page 76 OFF or power is disconnected to the ice machine. In all failure modes, disconnecting HES #2 from the control board will result in Switch Fails Open or Is Disconnected symptoms (see previous page). Part Number STH044 1/18...
  • Page 77 Reconnect dispense switch and test both relays Step 4 for line voltage: • Wires #58 & #54 = Ice Dispense Motor • Wires #52 & #56 = Water Solenoid • Replace wiring, component or control board as required. Part Number STH044 1/18...
  • Page 78 If the sensor does not activate the switch, disconnect the sensor wire from the sensor control board. Short +5 and SIG. • If the contacts close, replace the sensor. • If the contacts remain open, replace the sensor control board. Part Number STH044 1/18...
  • Page 79 Closed = Replace the touchless sensing control board • Open = Dispense control board is not functioning correctly, check control board relays Replace the selector switch if ohm readings do not match all three switch settings. Part Number STH044 1/18...
  • Page 80 2. Isolate the switch by disconnecting all wires from the switch. 3. Check across the switch terminals with an ohm meter. Activation Lever Position Resistance Reading Depressed Closed Released Open Replace the selector switch if ohm readings do not match. Part Number STH044 1/18...
  • Page 81 • If the dispensing continues, disconnect wires 22 & 59/60 from the control board. 2. Check resistance across control board contacts. • Closed = Replace the sensor control board • Open = Refer to selector switch diagnostics Part Number STH044 1/18...
  • Page 82 ICE/OFF/CLEAN switch to OFF to stop ice machine operation. Replace the HPCO control if it: 1. Will not reset (below 300 psig [2068 kPa 20.68 bar]). 2. Does not open at the specified cut-out point. Part Number STH044 1/18...
  • Page 83 2. Connect manifold gauge set to ice machine. 3. Hook voltmeter in parallel across the fan cycle control, leaving wires attached. 4. Refer to chart below. FCC Setpoint: Reading Should Be: Should Be: Above Cut-In 0 Volts Running Below Cut-Out Line Voltage Part Number STH044 1/18...
  • Page 84 2. Disconnect wires from low pressure switch and connect ohm meter across LPCO terminals. Replace the LPCO control if it: 1. Is not closed at the specified setpoint. 2. Does not open at the specified setpoint. Part Number STH044 1/18...
  • Page 85 Check continuity between all three terminals and the compressor shell or copper refrigeration line. Scrape metal surface to get good contact. If continuity is present, the compressor windings are grounded and the compressor should be replaced. Part Number STH044 1/18...
  • Page 86 • A good test is to install a known good substitute capacitor. • Use a capacitor tester when checking a suspect capacitor. Clip the bleed resistor off the capacitor terminals before testing. Part Number STH044 1/18...
  • Page 87 (start capacitor in series with the start winding). The relay senses the voltage generated by the start winding and opens the contacts as the compressor motor starts. The contacts remain open until the compressor is de-energized. Part Number STH044 1/18...
  • Page 88 • Defective capacitor. • Defective compressor. 6. Verify voltage and replace all start components. 7. If all of the previous tests are satisfactory and the compressor will not operate or continue to operate, replace the compressor. Part Number STH044 1/18...
  • Page 89 Ippottat Replace the liquid line drier before evacuating and recharging. Use only a Manitowoc (OEM) liquid line filter-drier to prevent voiding the warranty. CONNECTIONS Manifold gauge sets must utilize low loss fittings to comply with U.S.
  • Page 90 Turn off the pump and perform a standing vacuum leak check. NOTE: Check for leaks using an electronic leak detector after charging the ice machine. 4. Follow the Charging Procedures on the next page. Part Number STH044 1/18...
  • Page 91 Charging Procedures Ippottat The charge is critical on all Manitowoc ice machines. Use a scale to ensure the proper charge is installed. 1. Be sure the toggle switch is in the OFF position. MANIFOLD SET CLOSED OPEN LOW SIDE HIGH SIDE...
  • Page 92 Allow the pressures to equalize while the ice machine is in the Freeze cycle. Remove the quick disconnect fitting from the low side access valve at the ice machine and install both access valve caps. Part Number STH044 1/18...
  • Page 93 This section describes the basic requirements for restoring contaminated systems to reliable service. Ippottat Manitowoc Ice assumes no responsibility for the use of contaminated refrigerant. Damage resulting from the use of contaminated refrigerant is the sole responsibility of the servicing company.
  • Page 94 No burnout deposits in open compressor lines Severe Compressor Burnout symptoms Severe Oil is discolored, acidic, and smells acrid contamination Burnout deposits found in the compressor, cleanup procedure lines, and other components Part Number STH044 1/18...
  • Page 95 You should use an electronic leak detector after system charging to be sure there are no leaks. 5. Charge the system with the proper refrigerant to the nameplate charge. 6. Operate the ice machine. Part Number STH044 1/18...
  • Page 96 6. Install a suction line filter-drier with acid and moisture removal capability. Place the filter drier as close to the compressor as possible. 7. Install an access valve at the inlet of the suction line drier. 8. Install a new liquid line drier. Part Number STH044 1/18...
  • Page 97 Repeat until the pressure drop is acceptable. 12. Operate the ice machine for 48-72 hours. Then remove the suction line drier and change the liquid line drier. 13. Follow normal evacuation procedures. Part Number STH044 1/18...
  • Page 98 Tighten the wing nuts until the block is tight and the tubing is rounded. NOTE: The pressure controls will operate normally once the tubing is re-rounded. Tubing may not re-round 100%. Part Number STH044 1/18...
  • Page 99 FIG. A - “PINCHING OFF” TUBING FIG. B - RE-ROUNDING TUBING SV1406 USING PINCH OFF TOOL Part Number STH044 1/18...
  • Page 100 THIS PAGE INTENTIONALLY LEFT BLANK Part Number STH044 1/18...
  • Page 101 Using an improperly sized filter-drier will cause the ice machine to be improperly charged with refrigerant. Listed below is the recommended OEM field replacement drier: Model Drier Size End Connection Size RNS012 RNS020 DML-032S 1/4" Part Number STH044 1/18...
  • Page 102 Serial plate information overrides information listed on this page. Model Refrigerant Charge RNS012A/RNS020A 9 oz. / 255 g NOTE: All ice machines are charged using R-404A refrigerant. Part Number STH044 1/18...
  • Page 103 Water temperature will affect suction and discharge pressure - 50° water temperature will result in pressures on the lower end of the ranges specified. 90° water temperatures will result in pressures on the upper end of the ranges specified. Part Number STH044 1/18...
  • Page 104 90/32 °F/°C 50/10 70/21 80/27 90/32 100/38 Operating Pressures (PSIG) Air Temperature Freeze Cycle Entering Condenser Discharge Suction °F/°C Pressure Pressure 170-180 38-42 50/10 230-260 38-42 70/21 270-320 38-42 90/32 320-375 38-42 100/38 340-400 38-42 110/43 Part Number STH044 1/18...
  • Page 105 90/32 °F/°C 50/10 70/21 80/27 90/32 100/38 Operating Pressures (PSIG) Air Temperature Freeze Cycle Entering Condenser Discharge Suction °F/°C Pressure Pressure 170-180 38-42 50/10 230-270 38-42 70/21 280-330 38-42 90/32 330-385 38-42 100/38 260-420 38-42 110/43 Part Number STH044 1/18...
  • Page 106 THIS PAGE INTENTIONALLY LEFT BLANK Part Number STH044 1/18...
  • Page 108 MANITOWOC ICE 2110 SOUTH 26TH STREET MANITOWOC, WI 54220 800-545-5720 WWW.MANITOWOCICE.COM ©2018 Manitowoc Ice Inc. except where explicitly stated. All rights reserved. Continuing product improvement may necessitate change of specifications without notice. Part Number STH044 1/18...

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